I’m programming a small batch on a VF‑2 from prints heavy on true position and MMC, and I need a quick reference that maps common callouts to practical toolpath/inspection choices (e.g., Ø0.250 ±0.0005 bore with TP 0.002(M) and 0.015 x 45° chamfer). What pocket guide or PDF do you keep at the machine that’s accurate to ASME Y14.5‑2018 and helps translate blueprint intent to CAM ops and probing routines?
And i keep the TEC‑Ease GD&T Pocket Guide (2018) at the VF‑2; it’s accurate and the quick “callout → inspect/program” blurbs cover TP at MMC cleanly. For a Ø0.250 ±0.0005 bore with TP 0.002(M), I finish with a spring pass, WIPS‑probe size and center, and gate it as “pos_err <= 0.002 + (meas_dia − 0.2495)” to cash the bonus — MMC is free money; if you’re not probing, a 0.2495 plug plus a CMM check works too.
Quick example: for bores with TP at MMC, I helical‑bore, add a spring pass, then probe size/center and aim the toolpath to the allowed zone by thinking “bonus = actual − MMC” instead of chasing zero. I keep the Sigmetrix Y14.5‑2018 wall chart at the VF‑2, and I’ll sanity‑check TP with True Position Calculator | GD&T Basics — handy but not gospel. Bonus is like bowling bumpers: the larger (within spec) the bore, the wider your lane.
On the VF‑2 I taped a tiny “allowable TP = FCF value + (actual − MMC)” note on the pendant and tied it to WIPS: probe the bore, compute the bonus, and let the macro flag pass/fail so offset tweaks are obvious mid‑run; @norwalk’s pocket guide is solid, but watch WIPS can be skewed by the entry chamfer — probe at depth or kiss‑deburr first.